You gain a monstrous Natural weapon, like a stinger, horns, or spines. It has the Natural tag, and a number of additional tags equal to your Monster Calling. Attempts to conceal this feature have a +1 Difficulty, but you can spend Momentum to hide it, causing it to retract into your flesh; it may then be released as a reflexive action. You can take this Knack (Monster) times, creating a new Natural weapon each time.